Sat_old

Capillary saturation function of van Genuchten for unimodal or bimodal pore space distributions.

Provides functions for (1) soil water retention (SWC) and unsaturated hydraulic conductivity (Ku) (van Genuchten-Mualem (vGM or vG) [1, 2], Peters-Durner-Iden (PDI) [3, 4, 5], Brooks and Corey (bc) [8]), (2) fitting of parameter for SWC and/or Ku using Shuffled Complex Evolution (SCE) optimisation and (3) calculation of soil hydraulic properties (Ku and soil water contents) based on the simplified evaporation method (SEM) [6, 7].
Main references:
[1] van Genuchten (1980) <doi:10.2136/sssaj1980.03615995004400050002x>,
[2] Mualem (1976) <doi:10.1029/WR012i003p00513>,
[3] Peters (2013) <doi:10.1002/wrcr.20548>,
[4] Iden and Durner (2013) <doi:10.1002/2014WR015937>,
[5] Peters (2014) <doi:10.1002/2014WR015937>,
[6] Wind G. P. (1966),
[7] Peters and Durner (2008) <doi:10.1016/j.jhydrol.2008.04.016> and
[8] Brooks and Corey (1964).

Ullrich Dettmann

SoilHyP

Soil Hydraulic Properties

Felix Andrews

Brecht Donckels

Qingyun Duan

Sat_old function

<dl><dt>suc</dt>
<dd>Suction/pressure heads. Negative if suc.negativ = TRUE</dd>
<dt>par.shp</dt>
<dd>named parameter in list or vector</dd>
<dt>modality</dt>
<dd>pore size distribution ('uni' or 'bi')</dd>
<dt>suc.negativ</dt>
<dd>set TRUE if suction/pressure heads are negative and FALSE if positive</dd></dl>

Arguments

Capillary saturation function — Sat_old

<dl>

<dt>suc</dt>
<dd>Suction/pressure heads. Negative if suc.negativ = TRUE</dd>


<dt>par.shp</dt>
<dd>named parameter in list or vector</dd>


<dt>modality</dt>
<dd>pore size distribution ('uni' or 'bi')</dd>


<dt>suc.negativ</dt>
<dd>set TRUE if suction/pressure heads are negative and FALSE if positive</dd>

</dl>

Sat_old: Capillary saturation function

Description

Usage

Arguments

Details

References